FZUS52 KKEY 200331
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1031 PM EST Fri Dec 19 2025
Florida Bay, Hawk Channel and Straits of Florida from Ocean Reef
to south of Dry Tortugas, and the extreme southeastern Gulf of
America, including The Florida Keys National Marine Sanctuary
Seas are given as significant wave height, which is the average
height of the highest 1/3 of the waves. Individual waves may be
more than twice the significant wave height.
Wave Detail will include details about the period and direction
of origin for the highest energy waves. Long-period swells coming
from a different direction than the wind would be included in the
Wave Detail.
GMZ005-200930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1031 PM EST Fri Dec 19 2025
.SYNOPSIS...A very weak cold front over the southern Florida
Peninsula and southern Gulf of Mexico will move southward
overnight and Saturday, becoming stationary over the Straits of
Florida. A brief surge of moderate to fresh northerly breezes will
follow the front, peaking late tonight and early Saturday. A
continental high pressure cell will advance eastward from the
southeastern United States to the western North Atlantic this
weekend. The high will be reinforced by cold continental air
Sunday and Sunday night, and fresh to strong northeast to east
breezes are expected to develop across all Florida Keys coastal
waters Sunday night, persisting through at least Christmas Eve.
The Approximate Shoreward Edge of the Gulf Stream as of December 15...
26 NM South of Dry Tortugas Light...on Loggerhead Key.
21 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
15 NM South of Sand Key Light...off Key West.
18 NM South of Looe Key...off Big Pine Key.
16 NM Southeast of Sombrero Key Light...off Marathon.
13 NM Southeast of Alligator Reef Light...off Islamorada.
7 NM Southeast of Molasses Reef Light...off Key Largo.
3 NM Southeast of Carysfort Reef Light...off Ocean Reef.
Gulf Stream Information Courtesy of the National Weather Service in
Key West based on products from NASA SPoRT and RTOFS.
$$
GMZ031-200930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...Northwest winds 10 to 15 knots, becoming north to
northeast and increasing to near 15 knots late. Bay waters a light
to moderate chop, becoming a moderate chop late.
.SATURDAY...North to northeast winds near 15 knots early,
decreasing to near 10 knots. Bay waters a moderate chop early,
becoming a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Bay
waters a light chop.
.SUNDAY...Northeast to east winds near 10 knots, increasing to 10
to 15 knots. Bay waters a light chop, becoming a light to moderate
chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Bay waters a light to moderate chop, becoming a moderate
chop.
.MONDAY...Northeast winds increasing to 15 to 20 knots. Bay
waters becoming choppy.
.MONDAY NIGHT THROUGH TUESDAY NIGHT...Northeast to east winds 15
to 20 knots. Bay waters choppy.
.WEDNESDAY...Northeast to east winds 15 to 20 knots. Bay waters
choppy.
.WEDNESDAY NIGHT...Northeast to east winds near 15 knots. Bay
waters a moderate chop.
$$
GMZ032-035-200930-
Bayside and Gulfside from Craig Key to west end of Seven Mile
Bridge-
Gulf of America from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...Northwest to north winds near 10 knots, becoming
north to northeast and increasing to near 15 knots late. Seas
around 1 foot, building to 1 to 3 feet late. Nearshore waters a
light chop, becoming a moderate chop. late.
.SATURDAY...North to northeast winds near 15 knots early, becoming
northeast to east and decreasing to near 10 knots. Seas 1 to 3
feet early, subsiding to around 1 foot. Nearshore waters a
moderate chop early, becoming a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
1 to 2 feet. Nearshore waters a light chop.
.SUNDAY...Northeast winds near 10 knots, increasing to 10 to 15
knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a
light to moderate chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate
chop, becoming a moderate chop.
.MONDAY...Northeast to east winds 15 to 20 knots. Seas 1 to
2 feet, building to 2 to 3 feet. Nearshore waters choppy.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Seas 2 to
3 feet, except building to 3 to 4 feet, occasionally to 5 feet
west of the Marquesas Keys. Nearshore waters rough.
.TUESDAY...Northeast to east winds decreasing to 15 to 20 knots.
Seas 2 to 3 feet. West of the Marquesas Keys, seas 3 to 4 feet,
occasionally to 5 feet, subsiding to around 3 feet. Nearshore
waters becoming choppy. Isolated showers.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Northeast to east winds
15 to 20 knots. Seas 2 to 3 feet. Nearshore waters choppy.
$$
GMZ042>044-200930-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...Northwest to north winds near 10 knots, becoming
north to northeast and increasing to near 15 knots late. Seas
around 1 foot, building to 1 to 2 feet late. Nearshore waters a
light chop, becoming a moderate chop late.
.SATURDAY...North to northeast winds near 15 knots early, becoming
northeast and decreasing to near 10 knots. Seas 1 to 3 feet early,
subsiding to 1 to 2 feet. Nearshore waters a moderate chop early,
becoming a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
1 to 2 feet. Nearshore waters a light chop.
.SUNDAY...Northeast winds near 10 knots, increasing to 10 to 15
knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light
to moderate chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to
15 to 20 knots. Seas 2 to 3 feet. Nearshore waters a light to
moderate chop, becoming choppy. Isolated showers.
.MONDAY...Northeast winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters choppy.
.MONDAY NIGHT...Northeast to east winds increasing to near 20
knots. Seas building to 3 to 5 feet, occasionally to 6 feet.
Nearshore waters rough. Isolated showers.
.TUESDAY...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters rough. Isolated
showers.
.TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet.
Nearshore waters rough, becoming choppy.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds 15 to 20
knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters
choppy.
$$
GMZ052>055-072>075-200930-
Straits of Florida from Ocean Reef to Craig Key out 20 NM-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge out 20 NM-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal out 20 NM-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas out 20 NM-
Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge 20 to 60 NM out-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal 20 to 60 NM out-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas 20 to 60 NM out-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...North winds near 10 knots, becoming north to
northeast and increasing to 10 to 15 knots. Seas 1 to 2 feet,
building to 2 to 4 feet. Wave Detail: Northeast 2 feet at 4
seconds and northwest 1 foot at 3 seconds.
.SATURDAY...Northeast winds near 15 knots early, becoming
northeast to east and decreasing to 10 to 15 knots. Seas 2 to 4
feet. Wave Detail: North 3 feet at 4 seconds.
.SATURDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
2 to 3 feet. Wave Detail: Northeast to east 2 feet at 4 seconds
and northwest 2 feet at 6 seconds. Isolated showers.
.SUNDAY...Northeast to east winds 10 to 15 knots, increasing to
near 15 knots. Seas around 3 feet. Isolated showers.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots. Seas building to 3 to 5 feet, occasionally to 6
feet. Isolated showers.
.MONDAY...Northeast winds increasing to near 20 knots. Seas
building to 5 to 7 feet, occasionally to 9 feet. Isolated
showers.
.MONDAY NIGHT AND TUESDAY...Northeast to east winds 20 to 25
knots. Seas 6 to 9 feet, occasionally to 11 feet. Isolated
showers.
.TUESDAY NIGHT...Northeast to east winds near 20 knots. Seas
subsiding to 5 to 7 feet, occasionally to 9 feet. Isolated
showers.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds near 20
knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated showers.
$$
GMZ033-034-200930-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...Northwest to north winds near 10 knots, becoming
north to northeast and increasing to near 15 knots late. Seas 1 to
2 feet, building to 2 to 3 feet. Wave Detail: Northwest 3 feet at
4 seconds.
.SATURDAY...North to northeast winds near 15 knots early, becoming
northeast and decreasing to near 10 knots. Seas 2 to 3 feet early,
subsiding to 1 to 2 feet. Wave Detail: Northwest to north 3 feet
at 5 seconds.
.SATURDAY NIGHT...Northeast winds near 10 knots. Seas around 2
feet. Wave Detail: Northwest 3 feet at 6 seconds.
.SUNDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
.SUNDAY NIGHT...Northeast winds near 10 knots, becoming northeast
to east and increasing to 10 to 15 knots. Seas 1 to 2 feet,
building to around 2 feet.
.MONDAY...Northeast to east winds near 15 knots, increasing to 15
to 20 knots. Seas around 2 feet, building to 2 to 4 feet,
occasionally to 5 feet.
.MONDAY NIGHT AND TUESDAY...Northeast to east winds 15 to 20
knots. Seas 3 to 5 feet, occasionally to 6 feet.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 4 feet, occasionally to 5 feet.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds 15 to 20
knots. Seas 2 to 4 feet, occasionally to 5 feet.
$$
Kasper
CWFKEY
Coastal Waters Forecast for the Florida Keys
National Weather Service Key West FL
1031 PM EST Fri Dec 19 2025
Florida Bay, Hawk Channel and Straits of Florida from Ocean Reef
to south of Dry Tortugas, and the extreme southeastern Gulf of
America, including The Florida Keys National Marine Sanctuary
Seas are given as significant wave height, which is the average
height of the highest 1/3 of the waves. Individual waves may be
more than twice the significant wave height.
Wave Detail will include details about the period and direction
of origin for the highest energy waves. Long-period swells coming
from a different direction than the wind would be included in the
Wave Detail.
GMZ005-200930-
Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas
1031 PM EST Fri Dec 19 2025
.SYNOPSIS...A very weak cold front over the southern Florida
Peninsula and southern Gulf of Mexico will move southward
overnight and Saturday, becoming stationary over the Straits of
Florida. A brief surge of moderate to fresh northerly breezes will
follow the front, peaking late tonight and early Saturday. A
continental high pressure cell will advance eastward from the
southeastern United States to the western North Atlantic this
weekend. The high will be reinforced by cold continental air
Sunday and Sunday night, and fresh to strong northeast to east
breezes are expected to develop across all Florida Keys coastal
waters Sunday night, persisting through at least Christmas Eve.
The Approximate Shoreward Edge of the Gulf Stream as of December 15...
26 NM South of Dry Tortugas Light...on Loggerhead Key.
21 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
15 NM South of Sand Key Light...off Key West.
18 NM South of Looe Key...off Big Pine Key.
16 NM Southeast of Sombrero Key Light...off Marathon.
13 NM Southeast of Alligator Reef Light...off Islamorada.
7 NM Southeast of Molasses Reef Light...off Key Largo.
3 NM Southeast of Carysfort Reef Light...off Ocean Reef.
Gulf Stream Information Courtesy of the National Weather Service in
Key West based on products from NASA SPoRT and RTOFS.
$$
GMZ031-200930-
Florida Bay including Barnes Sound, Blackwater Sound, and
Buttonwood Sound-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...Northwest winds 10 to 15 knots, becoming north to
northeast and increasing to near 15 knots late. Bay waters a light
to moderate chop, becoming a moderate chop late.
.SATURDAY...North to northeast winds near 15 knots early,
decreasing to near 10 knots. Bay waters a moderate chop early,
becoming a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Bay
waters a light chop.
.SUNDAY...Northeast to east winds near 10 knots, increasing to 10
to 15 knots. Bay waters a light chop, becoming a light to moderate
chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Bay waters a light to moderate chop, becoming a moderate
chop.
.MONDAY...Northeast winds increasing to 15 to 20 knots. Bay
waters becoming choppy.
.MONDAY NIGHT THROUGH TUESDAY NIGHT...Northeast to east winds 15
to 20 knots. Bay waters choppy.
.WEDNESDAY...Northeast to east winds 15 to 20 knots. Bay waters
choppy.
.WEDNESDAY NIGHT...Northeast to east winds near 15 knots. Bay
waters a moderate chop.
$$
GMZ032-035-200930-
Bayside and Gulfside from Craig Key to west end of Seven Mile
Bridge-
Gulf of America from west end of Seven Mile Bridge to Halfmoon
Shoal out to 5 Fathoms-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...Northwest to north winds near 10 knots, becoming
north to northeast and increasing to near 15 knots late. Seas
around 1 foot, building to 1 to 3 feet late. Nearshore waters a
light chop, becoming a moderate chop. late.
.SATURDAY...North to northeast winds near 15 knots early, becoming
northeast to east and decreasing to near 10 knots. Seas 1 to 3
feet early, subsiding to around 1 foot. Nearshore waters a
moderate chop early, becoming a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
1 to 2 feet. Nearshore waters a light chop.
.SUNDAY...Northeast winds near 10 knots, increasing to 10 to 15
knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a
light to moderate chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to near
15 knots. Seas 1 to 2 feet. Nearshore waters a light to moderate
chop, becoming a moderate chop.
.MONDAY...Northeast to east winds 15 to 20 knots. Seas 1 to
2 feet, building to 2 to 3 feet. Nearshore waters choppy.
.MONDAY NIGHT...Northeast to east winds near 20 knots. Seas 2 to
3 feet, except building to 3 to 4 feet, occasionally to 5 feet
west of the Marquesas Keys. Nearshore waters rough.
.TUESDAY...Northeast to east winds decreasing to 15 to 20 knots.
Seas 2 to 3 feet. West of the Marquesas Keys, seas 3 to 4 feet,
occasionally to 5 feet, subsiding to around 3 feet. Nearshore
waters becoming choppy. Isolated showers.
.TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...Northeast to east winds
15 to 20 knots. Seas 2 to 3 feet. Nearshore waters choppy.
$$
GMZ042>044-200930-
Hawk Channel from Ocean Reef to Craig Key out to the reef-
Hawk Channel from Craig Key to west end of Seven Mile Bridge out
to the reef-
Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal
out to the reef-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...Northwest to north winds near 10 knots, becoming
north to northeast and increasing to near 15 knots late. Seas
around 1 foot, building to 1 to 2 feet late. Nearshore waters a
light chop, becoming a moderate chop late.
.SATURDAY...North to northeast winds near 15 knots early, becoming
northeast and decreasing to near 10 knots. Seas 1 to 3 feet early,
subsiding to 1 to 2 feet. Nearshore waters a moderate chop early,
becoming a light chop.
.SATURDAY NIGHT...Northeast to east winds near 10 knots. Seas
1 to 2 feet. Nearshore waters a light chop.
.SUNDAY...Northeast winds near 10 knots, increasing to 10 to 15
knots. Seas 1 to 2 feet. Nearshore waters a light chop, becoming a light
to moderate chop.
.SUNDAY NIGHT...Northeast winds 10 to 15 knots, increasing to
15 to 20 knots. Seas 2 to 3 feet. Nearshore waters a light to
moderate chop, becoming choppy. Isolated showers.
.MONDAY...Northeast winds 15 to 20 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Nearshore waters choppy.
.MONDAY NIGHT...Northeast to east winds increasing to near 20
knots. Seas building to 3 to 5 feet, occasionally to 6 feet.
Nearshore waters rough. Isolated showers.
.TUESDAY...Northeast to east winds near 20 knots. Seas 3 to
5 feet, occasionally to 6 feet. Nearshore waters rough. Isolated
showers.
.TUESDAY NIGHT...Northeast to east winds near 20 knots, decreasing
to 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet.
Nearshore waters rough, becoming choppy.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds 15 to 20
knots. Seas 3 to 4 feet, occasionally to 5 feet. Nearshore waters
choppy.
$$
GMZ052>055-072>075-200930-
Straits of Florida from Ocean Reef to Craig Key out 20 NM-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge out 20 NM-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal out 20 NM-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas out 20 NM-
Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out-
Straits of Florida from Craig Key to west end of Seven Mile
Bridge 20 to 60 NM out-
Straits of Florida from west end of Seven Mile Bridge to south of
Halfmoon Shoal 20 to 60 NM out-
Straits of Florida from Halfmoon Shoal to 20 NM west of Dry
Tortugas 20 to 60 NM out-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...North winds near 10 knots, becoming north to
northeast and increasing to 10 to 15 knots. Seas 1 to 2 feet,
building to 2 to 4 feet. Wave Detail: Northeast 2 feet at 4
seconds and northwest 1 foot at 3 seconds.
.SATURDAY...Northeast winds near 15 knots early, becoming
northeast to east and decreasing to 10 to 15 knots. Seas 2 to 4
feet. Wave Detail: North 3 feet at 4 seconds.
.SATURDAY NIGHT...Northeast to east winds 10 to 15 knots. Seas
2 to 3 feet. Wave Detail: Northeast to east 2 feet at 4 seconds
and northwest 2 feet at 6 seconds. Isolated showers.
.SUNDAY...Northeast to east winds 10 to 15 knots, increasing to
near 15 knots. Seas around 3 feet. Isolated showers.
.SUNDAY NIGHT...Northeast winds near 15 knots, increasing to 15
to 20 knots. Seas building to 3 to 5 feet, occasionally to 6
feet. Isolated showers.
.MONDAY...Northeast winds increasing to near 20 knots. Seas
building to 5 to 7 feet, occasionally to 9 feet. Isolated
showers.
.MONDAY NIGHT AND TUESDAY...Northeast to east winds 20 to 25
knots. Seas 6 to 9 feet, occasionally to 11 feet. Isolated
showers.
.TUESDAY NIGHT...Northeast to east winds near 20 knots. Seas
subsiding to 5 to 7 feet, occasionally to 9 feet. Isolated
showers.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds near 20
knots. Seas 5 to 7 feet, occasionally to 9 feet. Isolated showers.
$$
GMZ033-034-200930-
Gulf of America from East Cape Sable to Chokoloskee 20 to 60 NM
out and beyond 5 fathoms-
Gulf of America including Dry Tortugas and Rebecca Shoal Channel-
1031 PM EST Fri Dec 19 2025
.OVERNIGHT...Northwest to north winds near 10 knots, becoming
north to northeast and increasing to near 15 knots late. Seas 1 to
2 feet, building to 2 to 3 feet. Wave Detail: Northwest 3 feet at
4 seconds.
.SATURDAY...North to northeast winds near 15 knots early, becoming
northeast and decreasing to near 10 knots. Seas 2 to 3 feet early,
subsiding to 1 to 2 feet. Wave Detail: Northwest to north 3 feet
at 5 seconds.
.SATURDAY NIGHT...Northeast winds near 10 knots. Seas around 2
feet. Wave Detail: Northwest 3 feet at 6 seconds.
.SUNDAY...Northeast winds near 10 knots. Seas 1 to 2 feet.
.SUNDAY NIGHT...Northeast winds near 10 knots, becoming northeast
to east and increasing to 10 to 15 knots. Seas 1 to 2 feet,
building to around 2 feet.
.MONDAY...Northeast to east winds near 15 knots, increasing to 15
to 20 knots. Seas around 2 feet, building to 2 to 4 feet,
occasionally to 5 feet.
.MONDAY NIGHT AND TUESDAY...Northeast to east winds 15 to 20
knots. Seas 3 to 5 feet, occasionally to 6 feet.
.TUESDAY NIGHT...Northeast to east winds 15 to 20 knots. Seas
2 to 4 feet, occasionally to 5 feet.
.WEDNESDAY AND WEDNESDAY NIGHT...Northeast to east winds 15 to 20
knots. Seas 2 to 4 feet, occasionally to 5 feet.
$$
Kasper